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docs: add Common Questions section with GPU resolution guidance and noise seed explanation #1238

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docs: add Common Questions section with GPU resolution guidance and n…
lin-bot23 Jul 7, 2026
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Merge remote-tracking branch 'upstream/main' into analytics-fix/2026-…
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fix(troubleshooting): correct KSampler seed reference and remove em d…
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23 changes: 23 additions & 0 deletions troubleshooting/overview.mdx
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Expand Up @@ -464,6 +464,29 @@ When reporting any issue, include:
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## Common Questions

### What resolution or dimensions should I use for my GPU?

There is no single "best" resolution for a given GPU model. The maximum viable resolution depends on your specific model type, VRAM, and the workflow complexity. As a general guideline:

- **8 GB VRAM (e.g. RTX 3070, RTX 4060):** 512x512 to 1024x1024 for SD1.5/FLUX; smaller sizes for video models
- **12-16 GB VRAM (e.g. RTX 4070, RTX 3080, RTX 4080):** 768x768 to 1280x1280 for images; 512x512 video at shorter lengths
- **24 GB VRAM (e.g. RTX 4090, RTX 3090, A5000):** 1024x1024 to 1536x1536 for images; up to 640x640 video or longer clips
- **48 GB+ VRAM (e.g. A6000, A100):** Highest available resolutions, multi-workflow batching

Start with the default dimensions of the model you are using and increase gradually. If you run out of memory, reduce the resolution, switch to a fp8 quantized model, or lower your batch size.

### How does the noise seed work?

The **noise seed** controls the random noise pattern that the sampler starts from. Using the same seed, model, checkpoint, and parameters will produce the exact same result every time. This is useful for:

- **Reproducing a specific output:** share the seed along with your workflow
- **Comparing parameter changes:** keep the seed fixed and change only one setting to isolate its effect
- **Batch variation:** change the seed to explore different outputs

The seed is set in nodes like [RandomNoise](/built-in-nodes/RandomNoise) or in the `seed` input of [KSampler](/built-in-nodes/KSampler), or `noise_seed` in [KSamplerAdvanced](/built-in-nodes/KSamplerAdvanced) and [SamplerCustom](/built-in-nodes/SamplerCustom).

## Community Resources

- **Official Forum:** [forum.comfy.org](https://forum.comfy.org/)
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